<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Whole Screen</title>
<meta name="viewport" content="width=device-width,height=device-height,inital-scale=1.0,maximum-scale=1.0,user-scalable=no,">
<script src="./js/jquery-3.2.1.js"></script>
<body>
	<header> I am header </header>
	<script>
		$(function() {
			$("body").on("custom.event.click", function(){
				alert("custom.event.click");
			});
			
			$("body").trigger("custom.event.click");
		});
	</script>
</body>
</html>